Before you throw your silver coins in a jar or head to the vending machine, make sure you check the design or you could miss out. There are more than 54 different types of valuable 50p coins in circulation right now.

The value of the coin shoots up the rarer it is and there are seven 50p coins classified as scare and 47 as potentially valuable, according to coin experts at Change Checker.

Their website created a scarcity index that monitors these 50p coins in circulation based on their worth.

The rarest 50p coin is the Kew Gardens design worth up to £185 on auction websites when it is in mint condition.

The Jemima Puddleduck coin is also making headlines because it is the rarest of the Beatrix Potter 50p coins, selling for £29 on Ebay.

The Mirror spoke to Philip Mussell, the director of Coin News , for advice on which coins should be tossed in a jar and which should be posted on eBay.

Mr Mussell said: "There are a few different ways this happens. One is when a mistake is made by the Royal Mint, like a 20p without a date, for example, or a 1983 2p coin accidentally printed with the old wording 'New Pence'. Mistakes are eminently collectable.

"Other collectibles are redesigns or limited edition releases. For example, an Olympic 50p with a swimmer was recently re-released.

"The first minting had a swimmer with waves obscuring her face but the designer didn’t want that, so they unobscured her face and made it clear of wavy lines. That’s now quite collectable."

Find out if you have any of the rare examples:

1. Kew Garden 50p

This coin was released to celebrate the 250th anniversary of the foundation of Kew Gardens (Image: The Mirror, Change Checker)

The Kew Gardens 50p tops Change Checker's scarcity index list.

It's stamped with the Kew Gardens Pagoda and with just 210,000 minted compared to a standard minting of around five million, it's classed as very rare.

2. Football Olympic 50p

"The Olympic Sports 50p series was a revelation in coin collecting – for many it represents the start of their interest in UK circulation coins and thousands rose to the challenge of finding them all from their change," explained ChangeChecker.

There are 29 Olympic coins, but the football edition is classed as the rarest (although still over 1 million were struck).

Designed by journalist Neil Wolfson, the coin was created to encapsulate football in a simple image. As the offside rule is a perennial talking point, the image is designed to provoke discussion, which was what Wolfson was aiming for.

3. Triathlon Olympic 50p

(Image: Change Checker)

In 2012, the Royal Mint released 29 commemorative 50p coins representing the sports of the Olympic and Paralympic Games. The Football 50p is not the only valuable one in this set - in fact there are five that collectors are after.

The Triathlon coin by Sarah Harvey shows a runner, cyclist and swimmer. Royal Mint figures show there are 2,179,000 in circulation.

4. Judo Olympic 50p

(Image: The Mirror, Change Checker)

Another most sought after coin is the Judo 50p which also launched to celebrate the London Olympics. There are 1,161,500 in circulation right now.

5. Wrestling Olympic 50p

(Image: The Mirror, Change Checker)

Roderick Enriquez, a graphic designer from London, chose to design the wrestling 50p coin because it's such a well respected, historical sport, and of course, played a significant part in the Olympic and Paralympic Games. There are an estimated 1,129,500 in circulation at present.

6 and 7. Jemima Puddle Duck 50p and Squirrel Nutkin 50p

(Image: The Mirror, Change Checker)

In March last year, a batch of Peter Rabbit coins entered circulation in the Lake District and a few other British locations related to the works of Beatrix Potter. Shortly after, they started appearing on online marketplace eBay for far more than 50p shortly afterwards.

(Image: The Mirror, Change Checker)

There are three different sets of five Beatrix Potter 50p coins - Peter Rabbit, Jemima Puddle-Duck, Mrs Tiggy-Winkle, Squirrel Nutkin and a special 150th anniversary coin.

The 2016 Beatrix Potter 50p coins rank highly in the scarcity list, with Jemima Puddle-Duck and Squirrel Nutkin coming in at numbers 6 and 7 – based largely on the fact that not many people own them and they are in very high demand.

(Image: The Mirror, Change Checker)

If you've not been lucky enough to get one this time around, the Royal Mint has just released a new batch of Beatrix Potter coins - with some in colour - but they'll cost you £60.

More 50p coins that could be valuable - have you got any?

The Euro 50p

In 1992-93 50p coins celebrating the British presidency of the European Council were released (Image: The Mirror, Change Checker)

This 1992 50p piece featuring 12 stars and representing the EC Single Market has been known to sell for around £50-£55 online.

These are the old-fashioned chunky 50 pences so you are unlikely to turn one up in your change, but it could be worth checking any long-term penny jars for.

WWF 50p

This special edition features 50 tiny animals with the WWF panda at its heart (Image: The Mirror, Change Checker)

This commemorative coin is selling for more than £10, even if it has been in circulation a while and is no longer in mint condition.

Be careful when buying as some of these standard coins are being advertised at massively inflated prices. However, a few of the rarer editions are selling for hundreds of pounds – so look carefully when comparing.

Olympic Swimmer Aquatics 50p

Only 600 were released before the design was modified (Image: The Mirror, Change Checker)

The original Olympic aquatic coin with the wavy lines across the swimmer’s face has become very collectible as only 600 were released before the design was changed.

Just 600 is a tiny, tiny amount in the world of coin collecting and so these coins are changing hands for upwards of £800.